Woodward 723PLUS Technical Manual page 85

Manual 26482
Select the idle speed position from the speed setting device. Attempt to start the
engine. If the engine does not start or hesitates, increase the start fuel limit. Once
the engine has started and is running, the dynamics can be adjusted for optimal
performance. If the engine does not start, proceed to Chapter 6 for
troubleshooting. If necessary, on new or rebuilt engines, stabilize the engine as
soon a possible and allow the engine to run for some break-in period as specified
by the engine manufacturer.
Dynamics Adjustments
The objective of dynamic adjustments is to obtain an optimum, stable engine
speed response from minimum speed/load to rated speed/ load operation. The
control provides two complete sets of dynamic adjustments. All adjustments
described apply to both sets (E**DYNAMICS DE-CLUTCHED** or
F**DYNAMICS CLUTCHED**).
Do the following adjustments first for de-clutched dynamics. If changes are
needed, go to header E**DYNAMICS DE-CLUTCHED** to set the de-clutched
dynamics.
Then repeat the adjustments for clutched dynamics. If changes are needed, go to
header F**DYNAMICS CLUTCHED** to set the clutched dynamics.
1. No-Load Adjustments
Do this adjustment without load applied.
If speed is stable, slowly increase the Gain set point until the actuator output
or engine speed becomes slightly unstable then reduce the Gain as
necessary to stabilize the engine. If speed is unstable, reduce the Gain as
necessary to stabilize the engine.
After acceptable performance at no load, record the ACTUATOR
COMMAND % as read on the A**DISPLAY 1** menu. Set the Gain Slope
Breakpoint, found under the E**DYNAMICS DE-CLUTCHED* header, to this
reading.
2. Minimum Load Adjustment – Low Speed
Do this adjustment at the minimum speed and load conditions at which the
engine is operated.
Observe the movement of the actuator. If movement is excessive, reduce
the 01 Idle Gain set point slightly to achieve an acceptable actuator
movement level.
If there is a slow periodic cycling of the engine speed above and below the
speed setting, there are two possible causes:

01 Idle Gain is too high and 03 Reset is too low. Reduce the 01 Idle Gain by
50% (i.e., if the 01 Idle Gain was 2.2, reduce it to 1.1) and increase 03
Reset slightly. Observe the movement of the actuator or actuator output.
Continue to increase 03 Reset until the movement is active and acceptable
but not rapid or excessive. A final value of 03 Reset should be between 1.0
and 2.0 for most engines. If the 03 Reset value exceeds 2.0, but this
procedure continues to improve performance, increase the 04 Actuator
Compensation set point 50% and repeat the procedure.
Woodward
723PLUS Digital Marine Control
75